[英]What is the best approach to get injected beans with same interface in factory using Spring?
我創建了一個工廠,根據一些條件檢查來決定應返回哪種最佳實施。
// Factory
@Component
public class StoreServiceFactory {
@Autowired
private List<StoreService> storeServices;
public StoreService getService(){
if(isActiveSale){
return storeServices.get("PublicStoreService")
}
return storeServices.get("PrivateStoreService")
}
}
//Service Implementations
@Service
@Qualifier("PublicStoreService")
public class PublicStoreService implements StoreService {
public getStoreBalanceScore(){
Do Stuff....
}
}
@Service
@Qualifier("PrivateStoreService")
public class PrivateStoreService implements StoreService {
public getStoreBalanceScore(){
Do Stuff....
}
}
// Controller
@Autowired
StoreServiceFactory storeServiceFactory;
@Override
public StoreData getStoreBalance(String storeId) {
StoreService storeService = storeServiceFactory.getService();
return simulationService.simulate(sellerId, simulation);
}
這種方法好嗎? 如果是,我如何以一種優雅的方式獲得服務? 我只想使用注釋,而不使用配置。
您應該使用映射而不是List,並將字符串參數傳遞給getService方法。
public class StoreServiceFactory {
@Autowired
private Map<String,StoreService> storeServices = new HashMap<>();
public StoreService getService(String serviceName){
if(some condition...){
// want to return specific implementation on storeServices map, but using @Qualifier os something else
storeServices.get(serviceName)
}
}
}
您可以使用支持的實現來預填充地圖。 然后,您可以獲取適當的服務實例,如下所示:
// Controller
@Autowired
StoreServiceFactory storeServiceFactory;
@Override
public StoreData getStoreBalance(String storeId) {
StoreService storeService = storeServiceFactory.getService("private");//not sure but you could pass storeId as a parameter to getService
return simulationService.simulate(sellerId, simulation);
}
如果您不喜歡使用字符串,則可以為受支持的實現定義一個枚舉,並將其用作映射的鍵。
您無需在代碼上創建列表或映射。 您可以使用GenericBeanFactoryAccessor從Spring上下文直接檢索它。 這有多種方法來檢索特定的bean,例如基於名稱,注釋等。您可以在此處查看javadoc。 這避免了不必要的復雜性。
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